Grinding tool



June 20, 1933. J, K. E. DIFFENDERFFER 1,915,015

GRINDING TOOL Filed Nov. 6, 1929 Patented June 20, 1933 rarer orifice JOI-IN K. E. DIFFENDERFFEE, F BALTIBEORE, IMAEYLND, ASSQGNOR TO CARR- LONREY GLASS CO., GF BALTIMORE, MARYLAND GRL'NDLNG TOOL Application filed November 6, 1929. Serial No. 405,197.

This invention relates to a grinding tool or reainer designed primarily :tor use in grinding the inner' surfaces of botl'le nec is.

Heretoforo it has been practice, by seine bottle inanu'lncturcrs, to use a tool havin ,5; an axial bore or passage opening` at one end into the bottle being; treated. rlhe tool has also been ijirovided with one or more return channels in its outer sur ace so that walter and abrasive material admitted to the bottle can be was `red out through the channels.

lilhile a tool of the type described has worked eliicienlly where water can be snpplied under pressure, it has been 'found that it is not always possible to use it advanta geously where water under pressure is not available.

lt is an object of the prr-I4 nt invention to provide a grinding tool which can be used under all conditions, the relation ot t ie 'tool during the grinding operation being; utilized to set up a centrifugal action which will cause water to be delivered therefrom with considerable force and expelled through the r delivery channels with such speed as to carry away particles et glass.

lfilith the foiegoiin,y and other objects in View which will appear the description proceeds, the invention resides in the coinbination and arrangement or' parts and in the details of construction hereinafter described and i'alainied, it being` mulcrstood that changes in the precise embodinienfL oli the invention herein disclosed may be made within the scope of what is clainie(L without departing from the spirit ol the intention.

ln the accompanying drawing the preferred forni of the invention has been shown.

ln said drawing,

Figure l is a sec'lion tlnough the grinding);

, 1 cib tool held by a chuck and seated in the neck portion of a bottle.

Figure 2 is a side elevation ol" the tool. Figure 3 is a section on line 3 3, Figure 2.

Figure fl is an elevation of a portion oit the tool showing,` one o'f the outlet openings. Referring to the ligures by characers ol reference, l designates aV chuck having` jaws 2 adapted to grip the shank of a grinding tool. rlhis chuck has a spindle il extending therefrom and adapted to be rotated by any suitable ineans. The spindle is tubular and opens into au aperture 4li'orined in the chuck at Lhe base oi the shank receiving socket 5 in the chuck. This socket is designed to receive a washer G of any suitable sealing;` material such as leather, rubber, etc. and the washer cinistitutcs an abutment for the shank of the tool as hereinafter ex}')lained.

rlhe grinding tool has a tapered body portion 7 from the large end of which is eX- tendod a shank 8. Both the body portion and the shank are formed with opposed longitudinal channels 9 enterulingfrom one ond to the other of the tool, those ends of the channels within the free end portion ol' shank 8 beinel brought together at the axial center of the tool as shown at l0.

il. water conducting' tubo Yll is seated in each of the channels 9 and extends from one end to the other of the tool. These tubes converge `where the channels Colne together at l() so that, when the shank S is seated tightly against the washer' G, both tubes will be in coiuiniuiication with the opening' in the center of the washer. The other ends of the tubes are roi-ined with short longitudinal slots l2 opening` radially into the channels 9 and outwardly troni the tool.

The tubes ll ar held in the channels by any suitable means. llhey can be tightly wedged therein, soldered, or restrained by upsetting' the walls of the channels. The external diameter of each tube is l than the depth or its channel 9 at the shallowest point so that when the body portion of the tool is in engagement with a surface being ground there is always sullicient clearance between said surface and the tube to perniit free flow of water along the channels.

The body l is provided preferably with niinutc particles of diamonds held thereto in any suitable way, bese abrasive particles constituting the ineens tor quickly grinding, the inner surface ot a bottle neck when the tool rote-,o id at a high speed therein.

lt is designed to rotate the tool at a high speed and said tool is to be so mounted as to allow for a continuous flow of water through the spindle 3, opening i, and washer 6 into the ends 0i" the tub s ll. As the upper ends of the tubes diverge downwardly it will be apparent that as the tool is rotated at a high speed a centrifugal force will be set up within these diverging p0rtions of the tubes which will accelerate the flow of water through the tubes. rlhis flow will be 'further accelerated by centrifugal the tube for free circulation of the water when the body is in engagement with a surface being ground.

3. A grinding tool including a body and a shank, longitudinal channels in the body and shank, tubes seated within the channels and extending longitudinally of the tool, said tubes having a water inlet at the longitudinal axis of the tool and having outlets spaced from said axis whereby a circuforce at the outlet slots 12 where the water llOH Of Water through the tubes is set up will be thrown outwardly by the rapidly rotating tool.

`By means of the foregoing, a thorough washing of the bottle neck during the grinding operation is effected because the water delivered into the bottle will be expelled outwardly through the channels 9 and carry away particles of glass removed by the grinding operation. By utilizing centrifugal force as a means ior establishing a circulation of water it is not necessary to use water under pressure. Instead the chuck and the tool carried thereby can be connected to the outlet end of a siphon and the tool can even be supplied with water from a tank in which the bottle is partly submerged. The tool can also be supplied with water in containers supported adjacent thereto. Thus the apparatus can be set up at any point desired within a shop Without going to the expense of installing pipe lines.

A further advantage in constructing a tool such as described resides in the fact that when very small bottle necks are being ground it is not possible to have an axial bore and longitudinal external channels of sufiicient capacity to properly carry oft the particles ot glass during the grinding operation and at the same time maintain the requisite strength in the tool. I'Vith the present structure, however, no central bore is required, the channels only being utilized both for the inflow and outflow of the water. As a matter of fact in very small tools, one of the channels and the tube therein could be eliminated.

lVhat is claimed is:

1. A grinding tool having a longitudinal channel intersecting its grinding face, and means seated in and extending longitudinally of the channel 'for setting up a circulation ot water longitudinally of the tool by centrifugal force when the tool is rotated at a high speed.

2. A grinding tool including a. grinding body and a shank, there being a channel extending longitudinally of the body and shank, and a tube seated within and extending longitudinally of the channel, said tube having a water inlet at the axis of rotation of the tool and a water outlet remote from the axis of rotation, there being a clearance within the channel and along by centrifugal force when the tool is rotated, the maximum diameter ot the tubes being less than the minimum depth of the channels 111 the body.

In testimony that I claim the loregomg as my own, I have hereto aflixed my signature.

JOHN K. E. DIFFENDERFFER. 

